👉 Energies or substances that have a specific role in supporting or enhancing another substance. For example, hydrogen and oxygen are essential for life, but water is also an essential element of our environment.
👉 The concept of energy refers to the ability of an object or a system to do work. It is typically represented by the symbol E, and it is measured in joules (J). Energy can be converted into other forms such as heat, light, sound, or matter when applied to a system.